Rhif rhwng pump a saith yw chwech (6).

Chwech
Enghraifft o'r canlynolrhif naturiol, perfect number, rhif triongl, automorphic number, rhif cyfansawdd, eilrif, centered pentachoric number, centered pentagonal number, hexagonal number, pentagonal pyramidal number, pronic number, highly touchable number, strictly non-palindromic number, harshad number, semiprime, antisquare number Edit this on Wikidata
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